Treadle for sewing-machines.



No. 799,141. PATBNTED SEPT. 12, 1905.

J. C. BRMPTON L E. J. DOWLI TREADLE FOR SEWING MACH APPL IIIIIIIIII Bi)116.241, 1904.

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UNITED STATES PATENT OFFICE.

I JOSEPH C. BROMPTON AND EDVARD J. DOWLING, OF CHICAGO,

ILLINOIS.

TREADLE FOR SEWING-MACHINES.

Speccaton of Letters Patent.

Patented Sept. 12, 1905.

To @ZZ mitm it may concern:

Be it known that we, JOSEPH C. BRoMrTox an d EDWARD J. DowLING, citizensof th e United States, residing in Chicago, Illinois, have inventedcertain new and useful improvements in treadles for sewing-machines andlike mechanism in which the treadle-action on the pitman and its crankis aided by a spring mechanism, substantially as herein set forth.

IVe attain said ends by means of the mechanism constructed and appliedsubstantially as shown in the accompanying drawings, and in which-Figure 1 shows our said new and improved mechanism in plan view. Fig. 2shows the treadle and its attached parts in end view. Fig. 3 shows thelower part of the clamp K in end view elevation. Fig. 4 shows the nextor middle part ot' the clamp K in end View, and Fig. 5 shows the upperpart of the clamp K in end elevation. Fig. 6 shows Fig. 3 in plan view.Fig. T shows Fig. 4 in plan View, and Fig. 8 shows Fig. 5 in plan view.

Like reference-letters denote like parts throughout.

The treadle-fulcrum Z is the rod which connects the lower ends of thelegs of the sewingmachine. It is non-rotatable and on it vibrates thetreadle E, connected and attached to the pitmanrod and its crank in theusual way. To the rod (I is secured a clamp K, composed of the lowermember f, which embraces the lower halt' of the rod d, and embracing theupper half ot' the rod is the member g on which are grooves j, intowhich are laid the straight parts L of the wires which form the springor springs a, c. Said parts a are held in the grooves j and held down toplace by the covering-plate z, and on each end of the clamp K the wiresa are turned into coils ,which approach axially, and when they meet saidwires are twisted into a single element c, of which the longitudinalaxis diverges toward the treadle from the direction of the parts a andis finally bent directly toward the treadle or parallel to the rod Z andits ends passed under the treadle in substantially the same form at bothends, with the exception that at the lower end or that nearest theoperator the element c is somewhat shorter than that part at the otherend of the clamp K. vWhen said ends are turned under the treadle attheir proper places and set so as to be in constant contact with saidtreadle and are ot' suitable wire, the action of the sewing-machine isgreatly eased and made pleasanter. The action of said opposed springsends a c may also be regulated by loosening' the clamp K by the boltsfz' and turning the clamp to one side or the other on the rod Z untilthe desired condition of the counteracting ends is obtained.

IV hat we claim is- 1. The combination with a connecting-rod and atreadle, of a pair of clamps on said rod provided with transversegrooves, coiled wire springs at each side of the clamp connected bystraight spring-connecting members, in

said grooves, said coiled members meeting, axially, and united into asingle member, and connected to said treadle, and means to bind saidclamps and wires to place.

Q. The combination with a connecting-rod and a treadle, of clamps onsaid rod provided with transverse grooves, coiled wire springs at eachside oi' the clamp, 'connected by straight Vitnesses:

IVM. ZIMMERMAN,

J. F. PARKS.

